Implement URLUtils and URL interface

Source/core/html/URLUtils.idl

Index: Source/core/html/URLUtils.idl
diff --git a/Source/core/events/ResourceProgressEvent.idl b/Source/core/html/URLUtils.idl
similarity index 66%
copy from Source/core/events/ResourceProgressEvent.idl
copy to Source/core/html/URLUtils.idl
index 660b8b16105c9c679c70ecd0752df034cacb7716..99f07f6a146eba014e8850cd7755cec4296b781a 100644
--- a/Source/core/events/ResourceProgressEvent.idl
+++ b/Source/core/html/URLUtils.idl
@@ -23,16 +23,29 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-// ResourceProgressEvent is a non-standard class that is simply a ProgressEvent
-// with an additional read-only "url" property containing a string URL. This is
-// used by the Chromium NaCl integration to indicate to which resource the
-// event applies. This is useful because the NaCl integration will download
-// (and translate in the case of PNaCl) multiple binary files. It is not
-// constructable by web content at all, and so does not provide the usual
-// EventInit pattern for Event construction.
 [
     NoInterfaceObject,
-] interface ResourceProgressEvent : ProgressEvent {
-    readonly attribute DOMString url;
+    ImplementedAs=DOMURLUtils
+] interface URLUtils {
+    // Special case null for backwards compat with HTMLAnchorElement href.
+    // https://code.google.com/p/chromium/issues/detail?id=304959
+    [TreatNullAs=NullString] attribute DOMString href;
+
+    [NotEnumerable] DOMString toString();
+
+    readonly attribute DOMString origin;
+    attribute DOMString protocol;
+    attribute DOMString username;
+    attribute DOMString password;
+    attribute DOMString host;
+    attribute DOMString hostname;
+    attribute DOMString port;
+    attribute DOMString pathname;
+    attribute DOMString search;
+
+    // Not yet implemented.
+    // attribute URLQuery? query;
+
+    attribute DOMString hash;
 };